Windows 8 and 8.1 Forums


Win7-Win8 Dual boot problems

  1. #1


    Mumbai, India
    Posts : 98
    Windows 8.1 Pro, OS X Yosemite 10.10.4, Ubuntu GNOME 15.04

    Win7-Win8 Dual boot problems


    Hi

    I have a Lenovo G550 with Intel Pentium Dual Core T4400 @2.2 GHz and 3GB Ram. My laptop is triple booted with Windows 7 Professional Service Pack 1 32-bit, Windows 8 Release Preview 32-bit and Ubuntu 12.04 32-bit. The problem is that when I shut down from Windows 8 and the next time I start my laptop and select Windows 7, the screen just goes blank and nothing happens. I have to then force switch it off and then start it again for it to boot into Windows 7. Please help me to rectify this problem.

      My System SpecsSystem Spec

  2. #2


    Posts : 5,139
    Win8.1Pro - Finally!!!


    Start with using Startup Repair to attempt to repair the Win8 bootloader. IME the bootloader is very polite - it even keeps working when I physically remove my Win8 hard drive (leaving me with only Win7).

    To get into Startup Repair:
    - create a Startup Repair disk by typing "recdisc.exe" (without the quotes) into the Run dialog (press Win key and R to open it).
    - boot from the Startup Repair disk to run Startup Repair
    - run it at least 3 times.
      My System SpecsSystem Spec

  3. #3


    Mumbai, India
    Posts : 98
    Windows 8.1 Pro, OS X Yosemite 10.10.4, Ubuntu GNOME 15.04


    I will do this and report back to you asap. What's the problem btw? This happened in Consumer Preview too and now with Release Preview
      My System SpecsSystem Spec

  4. #4


    Posts : 5,139
    Win8.1Pro - Finally!!!


    I have no idea. This is just the first step in troubleshooting boot issues
      My System SpecsSystem Spec

  5. #5


    USA
    Posts : 79
    Windows 8


    You should turn off the fast start up option inside windows 8. https://www.eightforums.com/tutorials/6320-fast-startup-turn-off-windows-8-a.html

    It will cause extra hassles for those dual booting.

    With it enabled when you shut down the next time you power up it will actually start to load windows 8 but give you the option to load another operating system instead. In my case when it was on if I chose another operating system the computer would actually reboot and then load that OS. For you it sounds like its just going black and not rebooting.
      My System SpecsSystem Spec

  6. #6


    Mumbai, India
    Posts : 98
    Windows 8.1 Pro, OS X Yosemite 10.10.4, Ubuntu GNOME 15.04


    Quote Originally Posted by BFG View Post
    You should turn off the fast start up option inside windows 8. https://www.eightforums.com/tutorials/6320-fast-startup-turn-off-windows-8-a.html

    It will cause extra hassles for those dual booting.

    With it enabled when you shut down the next time you power up it will actually start to load windows 8 but give you the option to load another operating system instead. In my case when it was on if I chose another operating system the computer would actually reboot and then load that OS. For you it sounds like its just going black and not rebooting.
    It used to happen the same way. Then one day after updating it became like this
      My System SpecsSystem Spec

  7. #7


    Portsmouth Hants
    Posts : 772
    Windows 8.1 Pro with Media Center


    If the system folder (\boot) is on the same drive as your Windows 7 installation, Windows 8 sees the drive as the system volume, and may hide it by removing the drive letter if it runs the repair option in the boot menu - which means references to that drive cannot be seen by the BCD bootloader - thus Windows 7 fails to be found and cannot boot.

    Disk management usually is able to remedy that problem and give it a drive letter, like f:

    One remedy would be to make a small primary partition about 500MB in size, and make it active, give it the drive letter b: and using BCDBOOT transfer both systems' boot files to that partition by elevated command prompt -first from the working windows 8:

    bcdboot c:\windows /s B:

    and after that has successfully completed, the system files from Windows 7

    bcdboot f:\windows /s B:

    Depending on the way you have Ubuntu booting on the system, you may then have to reinstall Grub2 to the first disk - I used to find this always worked for me, but you'ld have to change sda, sdb5 for your actual active disk and then your partition designations:

    Code:
    When windows reinstallation wipes out grub, boot into a live Linux installation either on CD or USB - I use Mint 8 Helena,
    
    These instructions were found at 
    
    
    Fix / Restore GRUB Boot Loader ~ Web Upd8: Ubuntu / Linux blog
    
    
    
    
    
    
    $ sudo fdisk -l ----------------------------list the storage volumes
    
    
    The output should have several lines like this:
    
    
    device        boot    start    end    blocks    id    system
    /dev/sda1     *    nnnnn    nnnnn    nnnnn    7    HPFS.NTFS ---------------BOOT DISK sda
    etc
    /dev/sdb5         nnnnn    nnnnn    nnnnn    83    LINUX     ---------------FIRST LINUX PARTITION
    
    
    $ sudo mkdir /mnt/system  ------------------make a directory for the system
    
    
    $ sudo mount /dev/sdb5 /mnt/system ---------mount the linux volume there
    
    
    $ sudo -i ----------------------------------elevate permissions to root
    
    
    you are now root, the prompt has changed
    
    
    # mount -o bind /dev /mnt/system/dev -------to get inside the device so that changes can be made
    
    
    # chroot /mnt/system -----------------------become root of the installed system
    
    
    # grub-install /dev/sda --------------------install grub to the boot record on the boot disk 
    
    
    I always see a load of failure errors, but it says grub installed successfully  at the end!
      My System SpecsSystem Spec

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